Online Stopwatch
Time anything to a hundredth of a second. Press Start or the space bar, hit Lap at every split, and copy or export the results when you are done. It never drifts, and it keeps running even if you reload or close the tab.
Laps
- Laps
- 0
- Fastest
- –
- Slowest
- –
- Average
- –
| Lap | Lap time | Total |
|---|
Press Lap (or L) while the stopwatch runs to record lap and split times.
How to use the stopwatch
Start the stopwatch
Press Start or the space bar. The display counts up in hours, minutes, seconds and hundredths.
Record laps
Press Lap or L each time a lap, split or rep is done. Each row shows that lap’s time and the running total.
Stop and read the results
Press Stop or Space. The fastest lap is marked in green and the slowest in red, with the average beside them.
Export or reset
Copy the laps to paste into a spreadsheet, download a CSV file, or press Reset (R) to start over.
Lap time vs. split time
Both are recorded every time you press Lap. Here is the same three-lap run read both ways:
| Lap | Lap time | Split (total) |
|---|---|---|
| 1 | 01:02.00 | 01:02.00 |
| 2 | 01:00.00 | 02:02.00 |
| 3 | 01:04.00 | 03:06.00 |
Lap time is one lap on its own; split time is everything so far. Lap 2 is the fastest (green), lap 3 the slowest (red), and the average lap is 1:02.00.
What people time with a stopwatch
- Running, swimming and cycling laps
- Speeches, presentations and rehearsals
- Science experiments and reaction tests
- Speed-cubing, puzzles and games
- How long tasks really take at work
- Contractions, breathing and rest periods
Frequently asked questions
How accurate is this online stopwatch?
It reads the browser’s high-resolution clock and shows hundredths of a second. Elapsed time is always calculated from the moment you pressed Start rather than by counting ticks, so it does not drift or slow down in a background tab, however long it runs. The real limit is human reaction time — about 0.2 seconds to see something and press a button — so for very close races, use an electronic timing system.
What is the difference between a lap time and a split time?
A lap time is how long one lap took on its own. A split time (or cumulative time) is the total elapsed time at the moment you pressed Lap. If a runner does laps of 62, 60 and 64 seconds, the lap times are 1:02, 1:00 and 1:04, and the splits are 1:02, 2:02 and 3:06. The table shows both.
Does the stopwatch keep running if I close the tab or lock my phone?
Yes. The start time is saved in your browser, so when you come back the stopwatch shows the full elapsed time, including the time the page was closed, and your laps are still there.
Can I export my lap times?
Yes. Copy puts the laps on your clipboard as tab-separated text that pastes neatly into Excel, Google Sheets or Numbers. CSV downloads a file with the lap number, lap time and total time for each lap.
Are there keyboard shortcuts?
Space starts and stops, L records a lap, R resets and F switches full screen. Shortcuts are ignored while you are typing in a box.
How long can the stopwatch run?
As long as you like — the display adds hours after the first 59:59.99 and keeps going for days. There is no practical limit on the number of laps.
Can I show the stopwatch full screen?
Yes. Press the full-screen button or F and the digits scale to fill the display — handy for a gym wall, a classroom projector or a live stream. The screen is kept awake while it runs.
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Last reviewed October 31, 2026